Cool art!
Adding the intro/info shouldn't be too bad if you simplify to something like:
Name:
Ability:
Disposition:
In fact, since you're adding it in at this stage (with the pages already done), you can select a particular font (like "Stencil") and make it uniform and easily identifiable throughout the issue.

I don't think you're wrong, it's a very ambitious story, so many characters in one massive fight all drawn by various different artists... just getting it finished must have been difficult. Adding text identifying characters and abilities may help for the print version, if it goes to print. Speaking of which... how does resolution work with print, so many artists, different page sizes and page resolutions... headache city.

Great art! However...as I re-read this, I think the story suffers quite a bit b/c casual readers haven't a clue as to the names and abilities of the characters. Those of us who rec'd a script are familiar with the names and such and long time readers of H/A are familiar with Bombshell, Shell, Mr. Imp and so forth...but casual readers not involved with art duties have no idea who most of these newer heroes and villains are. The bald character on this page, for example, has appeared for the second time but has yet to be named. It's always a good idea to name characters when they first appear "on camera" either thru dialogue or narration. It's "old school" but it still works. Maybe we can rectify this for the deluxe hardcover print edition? End of rant.